Oscillators – Solid state active element oscillator – Significant distributed parameter resonator
Patent
1983-03-28
1985-09-10
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Significant distributed parameter resonator
331 96, 331177R, 333212, H03B 500
Patent
active
045409552
ABSTRACT:
A stable electromagnetic oscillator (30) comprises an amplifying element (3) in feedback association with a dual mode resonant cavity (12) that provides a double pole bandpass filter function. Two orthogonal modes (1 and 2) of electromagnetic energy resonate within the cavity (12). An output from the amplifying element (3) excitationally couples into the first mode (1), while the second mode (2) couples into the input of the amplifying element (3). The output (8) of the oscillator (30) is obtained from the first mode (1). Optional injection lock can be used for greater stability by means of coupling a stable a.c. reference (9) into the cavity (12) in alignment with the second mode (2). Optional electronic frequency tuning comprises a phase or frequency comparator (11) and a reference a.c. source (13), producing a d.c. feedback signal fed to varactor diodes (10). Coupling ports (4, 5, 6, 7) of the cavity (12) can be, e.g., irises, capacitive probes, coaxial probes, or any combination thereof. The electrical field associated with each port (4, 5, 6, 7) is aligned with the electrical field of the mode (1 or 2) coupled thereby. A dielectric resonator (20) can be positioned within the cavity (12) to allow for physical shrinking of the cavity (12) while maintaining the electromagnetic characteristics of the cavity (12).
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Ishihara et al., "A Highly Stabilized GaAs FET Oscillator Using a Dielectric Resonator Feedback Circuit in 9-14 GHz", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-28, No. 8, Aug. 1980, pp. 817-824.
Mori et al., "A Highly Stabilized GaAs FET Oscillator Using a Dielectric Resonator Feedback Circuit in 9-14 GHz", Technology Growth for the 80's: 1980 IEEE MTT-S, International Microwave Symposium Digest, May 28-30, 1980, pp. 376-378.
Ford Aerospace & Communications Corporation
LaRoche Eugene R.
Pascal Robert J.
Radlo Edward J.
Sanborn Robert D.
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